US20210053602A1 - Pallet sled - Google Patents
Pallet sled Download PDFInfo
- Publication number
- US20210053602A1 US20210053602A1 US16/933,681 US202016933681A US2021053602A1 US 20210053602 A1 US20210053602 A1 US 20210053602A1 US 202016933681 A US202016933681 A US 202016933681A US 2021053602 A1 US2021053602 A1 US 2021053602A1
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- US
- United States
- Prior art keywords
- pallet
- upper frame
- frame
- sled
- lower frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
- B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
- B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
- B62B3/0625—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground using rigid mechanical lifting mechanisms, e.g. levers, cams or gears
- B62B3/0631—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground using rigid mechanical lifting mechanisms, e.g. levers, cams or gears with a parallelogram linkage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/008—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor having more than two axes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
- B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
- B62B3/0606—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground manually operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
- B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
- B62B3/0618—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground using fluid lifting mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
- B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
- B62B3/0643—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground the wheels remaining stationary while the supporting surface is lifted
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B2203/00—Grasping, holding, supporting the objects
- B62B2203/20—Grasping, holding, supporting the objects using forks or tines
- B62B2203/24—Changing the position of the fork or supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
- B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
- B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
- B62B3/0612—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground power operated
Definitions
- Pallet sleds are used as to deliver pallets of goods, such as beverages, from a trailer into a store.
- the operator will use the sled to pick a pallet from the trailer, transport it through the parking lot/street/block/etc. and into the store.
- Common store types for this style of delivery are convenience stores.
- the driver may encounter obstacles such as ramps (ADA, sidewalk, etc.), potholes, ground undulations, door thresholds, curb or sidewalk thresholds that may require adequate maneuverability, additional control of the load (stability) on the sled and additional ground clearance.
- Standard and currently available equipment may not have the required maneuverability, control or ground clearance required.
- a pallet sled includes a lower frame and an upper frame.
- a plurality of pivot arms pivotably connect the upper frame to the lower frame.
- the upper frame is movable between a lowered position and raised position.
- the upper frame is spaced further from the lower frame in the raised position than in the lowered position.
- the upper frame is rotated slightly relative to the lower frame when moved from the lowered position to the raised position.
- the upper frame is rotated approximately 1.5 degrees to approximately 2.0 degrees toward the upright handle of the pallet sled. This provides additional clearance for the front of the pallet, by lifting those feet further off the ground. This also increases the stability of the load by shifting the center of mass toward the backrest of the handle. The length of the upper frame (and the whole pallet sled) may be reduced, which makes the pallet sled more maneuverable and lighter.
- the upper frame may be connected to the lower frame by a plurality of pivot arms.
- the relative lengths, positions, and axes of the pivot arms cause the upper frame to rotate slightly relative to the lower frame (and the floor) when moved to the raised position.
- FIG. 1 is a rear perspective view of the pallet sled.
- FIG. 2 is a front perspective view of the pallet sled of FIG. 1 .
- FIG. 3 is a rear perspective view of the pallet sled in an interim position of raising the upper frame relative to the lower frame.
- FIG. 4 is a front perspective view of the pallet sled of FIG. 3 .
- FIG. 5 is a rear perspective view of the pallet sled in a fully raised position.
- FIG. 6 is a front perspective view of the pallet sled of FIG. 5 .
- FIGS. 7-9 show the pallet sled with the upper frame in the low position.
- FIGS. 10-12 show the pallet sled in the process of lifting the pallet through an interim position.
- FIGS. 13-15 show the pallet sled with the upper frame lifted to its uppermost, lifted position.
- FIG. 16 is a side view of an alternate pallet sled with a manual lift mechanism in the low position.
- FIG. 17 shows the pallet sled of FIG. 16 in the raised position.
- FIG. 1 A pallet sled 10 according to one example is shown in FIG. 1 .
- the pallet sled 10 is used for lifting and moving pallets, particularly half-pallets, between a delivery trailer or truck and a store.
- FIG. 1 is a rear perspective view of the pallet sled 10 .
- FIG. 2 is a front perspective view of the pallet sled 10 of FIG. 1 .
- the pallet sled 10 includes a lower frame 12 and an upper frame 14 connected by outer pivot arms 16 at an outer end and inner pivot arms 18 at an inner end.
- the lower frame 12 includes a pair of spaced-apart lower arms 13 .
- the upper frame 14 includes a pair of spaced-apart upper arms 15 .
- the lower frame 12 and upper frame 14 are symmetric and the right side is the mirror image of the left side 10 .
- a U-shaped cradle 19 is mounted at the inner end of the upper frame 14 and opens outwardly.
- the lower frame 12 curves upward at the inner end and extends to a vertical handle portion 20 .
- a base 22 extends inwardly from a lower end of the vertical handle portion 20 .
- a pair of outer wheels 24 support the lower frame 12 at an outer end.
- a pair of inner wheels 26 are connected to the base 22 .
- a lift mechanism 30 such as a hydraulic lift mechanism 30 , is supported on the base 22 . Alternatively, the lift mechanism 30 can be electric, manual, electrohydraulic etc.
- the lift mechanism 30 is coupled to the upper frame 14 via linkage 32 . More specifically, the lift mechanism 30 is coupled to the cradle 19 (or other cross-bar) via linkage 32 .
- the cradle 19 couples the two sides of the pallet sled 10 to one another.
- the pallet sled 10 includes a pair of spaced-apart arms (each having part of the lower frame 12 and part of the lower frame 12 ) between which the feet of the pallet can be received.
- FIGS. 3 and 4 show the pallet sled 10 in an interim position of raising the upper frame 14 relative to the lower frame 12 .
- the user may activate the lift mechanism 30 by pumping the hydraulic mechanism foot pedal, causing the lift mechanism to lift upward on the cradle 19 . This causes the upper frame 14 to lift upward relative to the lower frame 12 .
- FIGS. 5 and 6 show the pallet sled 10 in a fully raised position, i.e. the upper frame 14 is the maximum distance from the lower frame 12 .
- the upper frame 14 pivots upward (and somewhat inward/rearward) on the inner pivot arms 18 and outer pivot arms 16 .
- the inner pivot arms 18 are substantially vertical and the outer pivot arms 16 are within 10 or 15 degrees of vertical.
- the outer ends of the upper frame 14 are higher above the floor than are the inner ends of the upper frame 14 and the cradle 19 .
- This is implemented by the length of the outer pivot arms 16 , the length of the inner pivot arms 18 and their respective pivot axes, which are all selected to cause the upper frame 14 to tilt toward the inner end slightly (e.g. approximately 1.5 to approximately 2.0 degrees).
- FIGS. 7-9 show the pallet sled 10 with the upper frame 14 in the low position.
- the pallet sled 10 is then rolled under a pallet 50 .
- the pallet 50 includes a deck 52 for supporting goods (such as cases or crates of beverage containers) thereon and a plurality of feet 54 supporting the deck 52 above the floor.
- the feet 54 are spaced inward from the outer periphery of the deck 52 .
- the upper arms 15 are received under the deck 52 outward of the feet 54 .
- the cradle 19 also is received under the deck 52 .
- the feet 54 of the pallet 50 are received between the upper arms 15 and between the lower arms 13 . In this position, the upper frame 14 and upper arms 15 are substantially parallel to the floor and to the lower frame 12 and to the lower arms 13 .
- FIGS. 10-12 show the pallet sled 10 in the process of lifting the pallet 50 through an interim position, based upon actuation of the lift mechanism 30 .
- the feet 54 are lifted from the floor.
- the upper frame 14 and cradle 19 lift the pallet 50 by the deck 52 .
- FIGS. 13-15 show the pallet sled 10 with the upper frame 14 lifted to its uppermost, lifted position.
- the outer ends of the upper frame 14 are higher above the floor than the inner ends of the upper frame 14 and the cradle 19 .
- This is implemented by the relative lengths and positions of the outer pivot arms 16 and the inner pivot arms and the positions of their axes which are selected to cause the upper frame 14 to tilt rearward toward the inner end slightly (e.g. approximately 1.5 to approximately 2.0 degrees).
- the upper frame 14 and upper arms 15 are tilted approximately 1.5 to approximately 2.0 degrees relative to the floor and to the lower frame 12 and to the lower arms 13 .
- Angling the upper frame 14 and/or cradle towards the vertical handle portion 20 /backrest could help with load stability by shifting the load center of mass towards the backrest. This is especially helpful when there is a sufficiently tall or imbalanced load or pallet 50 .
- the load contact with the vertical handle portion 20 (backrest) is increased also improving load stability.
- Angling the upper frame 14 and/or cradle 19 towards the vertical handle portion 20 may also help prevent the possibility that the loaded pallet 50 would slide off the pallet sled 10 , especially when coming to an abrupt stop. An abrupt stop could occur when hitting a pothole or tall threshold without adequate speed.
- Angling the upper frame 14 also increases the frontal ground clearance of the pallet 50 , particularly the lead feet 54 . This is especially helpful when entering or exiting ground undulations such as ramps (ADA, sidewalk, etc.) and door thresholds. This may prevent the pallet 50 or load from bottoming out on the ramp or threshold.
- ground undulations such as ramps (ADA, sidewalk, etc.) and door thresholds. This may prevent the pallet 50 or load from bottoming out on the ramp or threshold.
- Angling the upper frame 14 , cradle 19 or tine back may also permit the upper frame 14 and cradle 19 to be lower overall, which could increase maneuverability.
- the required support under the pallet 50 or load can also be reduced in length compared to a horizontal version due to the shift in center of mass rearward.
- a standard horizontal tine for a 48′′ long pallet 50 will be about 44-48′′ whereas a tilted tine (the upper arms 15 ) could be shorter, less than or equal to approximately 38′′ long, or approximately 29′′ to approximately 38′′ to provide the same amount of ground clearance.
- an upper frame 14 for a 42′′ pallet could be approximately 33′′ long or less.
- the linkage geometry allows the angle to be adjusted via the lengths of pivot arms 16 , 18 .
- adequate pallet support and ground clearance could be achieved with approximately 2.0 deg (+/ ⁇ 0.25 deg) tilt on a 48′′ long pallet and only approximately 1.5 deg (+/ ⁇ 0.25 deg) tilt on a 42′′ long pallet.
- FIGS. 16 and 17 show an alternate pallet sled 210 with a manual lift mechanism (i.e. no hydraulics, but only mechanical leverage).
- the sled 210 includes a lower frame 212 and upper frame 214 connected by outer pivot arms 216 and by inner pivot arms 217 .
- the outer pivot arms 216 are longer than the inner pivot arms 217 .
- a handle 220 connects to the lift mechanism 218 at a forward end of the sled 210 .
- a pair of casters 222 support the lower frame 212 at the forward end.
- a pair of wheels 224 support the lower frame 212 at the rearward end.
- the handle 220 is pivotably connected to the base 270 and the lower frame 212 .
- a pair of ratchet plates 274 are also pivotably connected to the base 270 about the same axis as the handle 220 .
- the ratchet plates 274 are pivotably connected to the upper frame 214 by a pair of angled brackets 275 .
- Each ratchet plate 274 includes a low notch 277 and a high notch 282 .
- An index crossbar 276 extends between vertical portions of the handle 220 and through elongated openings in each vertical portion.
- a spring 278 in each vertical portion of the handle 220 biases the index crossbar 276 downward. In the position shown, where the upper frame 214 is lowered, the index crossbar 276 is also received in the low notch 277 in each ratchet plate 274 and retained there by the spring 278 .
- a pivotable folding lever 284 is mounted to the handle 220 .
- the lever 284 can raise the index crossbar 276 upward within the elongated openings in the handle 220 , compressing the springs 278 .
- the handle 220 is engaged with the ratchet plates 274 , with the index crossbar 276 engaging the low notches 277 of the ratchet plates 274 , so that the upper frame 214 is in the lowered position, close to the lower frame 212 .
- the handle 220 can be pulled forward and down (not shown). This causes the ratchet plates 274 to pivot forward, drawing the upper frame 214 forward and upward (pivoting on arms 216 , 217 ).
- the upper frame 214 may pivot forward to a point where the arms 216 are past vertical, so that the upper frame 214 will remain in place even after force on the handle 220 is no longer applied.
- the outer pivot arms 216 are longer than the inner pivot arms 217 .
- Angling the upper frame 214 and/or cradle 270 towards the vertical handle portion 220 /backrest could help with load stability by shifting the load center of mass towards the backrest. This is especially helpful when there is a sufficiently tall or imbalanced load or pallet.
- the load contact with the vertical handle portion 220 /backrest is increased also improving load stability.
- angling the upper frame 214 , cradle 270 or arms back may also permit the pallet sled 210 to be shorter, which could increase maneuverability.
- the required support under the pallet or load can be reduced in length compared to the purely horizontal version due to the shift in center of mass rearward.
- a standard horizontal tine for a 48′′ long pallet 50 will be about 44-48′′ whereas a tilted tine could be shorter, less than or equal to approximately 38′′ long, or approximately 29′′ to approximately 38′′, to provide the same amount of ground clearance.
- an upper frame 14 for a 42′′ pallet could be approximately 33′′ long or less.
- the linkage geometry allows the angle to be adjusted via the lengths of pivot arms 216 , 217 .
- adequate pallet support and ground clearance could be achieved with about a 2.0 deg (+/ ⁇ 0.25 deg) tilt on a 48′′ long pallet and only about a 1.5 deg (+/ ⁇ 0.25 deg) tilt on a 42′′ long pallet.
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Abstract
Description
- Pallet sleds are used as to deliver pallets of goods, such as beverages, from a trailer into a store. During the delivery process, the operator will use the sled to pick a pallet from the trailer, transport it through the parking lot/street/block/etc. and into the store. Common store types for this style of delivery are convenience stores. During transportation, the driver may encounter obstacles such as ramps (ADA, sidewalk, etc.), potholes, ground undulations, door thresholds, curb or sidewalk thresholds that may require adequate maneuverability, additional control of the load (stability) on the sled and additional ground clearance. Standard and currently available equipment may not have the required maneuverability, control or ground clearance required.
- A pallet sled includes a lower frame and an upper frame. A plurality of pivot arms pivotably connect the upper frame to the lower frame. The upper frame is movable between a lowered position and raised position. The upper frame is spaced further from the lower frame in the raised position than in the lowered position. The upper frame is rotated slightly relative to the lower frame when moved from the lowered position to the raised position.
- In the example embodiment, the upper frame is rotated approximately 1.5 degrees to approximately 2.0 degrees toward the upright handle of the pallet sled. This provides additional clearance for the front of the pallet, by lifting those feet further off the ground. This also increases the stability of the load by shifting the center of mass toward the backrest of the handle. The length of the upper frame (and the whole pallet sled) may be reduced, which makes the pallet sled more maneuverable and lighter.
- The upper frame may be connected to the lower frame by a plurality of pivot arms. The relative lengths, positions, and axes of the pivot arms cause the upper frame to rotate slightly relative to the lower frame (and the floor) when moved to the raised position.
-
FIG. 1 is a rear perspective view of the pallet sled. -
FIG. 2 is a front perspective view of the pallet sled ofFIG. 1 . -
FIG. 3 is a rear perspective view of the pallet sled in an interim position of raising the upper frame relative to the lower frame. -
FIG. 4 is a front perspective view of the pallet sled ofFIG. 3 . -
FIG. 5 is a rear perspective view of the pallet sled in a fully raised position. -
FIG. 6 is a front perspective view of the pallet sled ofFIG. 5 . -
FIGS. 7-9 show the pallet sled with the upper frame in the low position. -
FIGS. 10-12 show the pallet sled in the process of lifting the pallet through an interim position. -
FIGS. 13-15 show the pallet sled with the upper frame lifted to its uppermost, lifted position. -
FIG. 16 is a side view of an alternate pallet sled with a manual lift mechanism in the low position. -
FIG. 17 shows the pallet sled ofFIG. 16 in the raised position. - A pallet sled 10 according to one example is shown in
FIG. 1 . Thepallet sled 10 is used for lifting and moving pallets, particularly half-pallets, between a delivery trailer or truck and a store.FIG. 1 is a rear perspective view of the pallet sled 10.FIG. 2 is a front perspective view of the pallet sled 10 ofFIG. 1 . - Referring to
FIGS. 1 and 2 , the pallet sled 10 includes alower frame 12 and anupper frame 14 connected byouter pivot arms 16 at an outer end andinner pivot arms 18 at an inner end. Thelower frame 12 includes a pair of spaced-apartlower arms 13. Theupper frame 14 includes a pair of spaced-apartupper arms 15. In this embodiment, there are twoouter pivot arms 16 and twoinner pivot arms 18 connecting eachupper arm 15 to eachlower arm 13 but one or more could also be used. - The
lower frame 12 andupper frame 14 are symmetric and the right side is the mirror image of theleft side 10. A U-shapedcradle 19 is mounted at the inner end of theupper frame 14 and opens outwardly. Thelower frame 12 curves upward at the inner end and extends to avertical handle portion 20. Abase 22 extends inwardly from a lower end of thevertical handle portion 20. A pair ofouter wheels 24 support thelower frame 12 at an outer end. A pair ofinner wheels 26 are connected to thebase 22. Alift mechanism 30, such as ahydraulic lift mechanism 30, is supported on thebase 22. Alternatively, thelift mechanism 30 can be electric, manual, electrohydraulic etc. - The
lift mechanism 30 is coupled to theupper frame 14 vialinkage 32. More specifically, thelift mechanism 30 is coupled to the cradle 19 (or other cross-bar) vialinkage 32. Thecradle 19 couples the two sides of the pallet sled 10 to one another. Thepallet sled 10 includes a pair of spaced-apart arms (each having part of thelower frame 12 and part of the lower frame 12) between which the feet of the pallet can be received. -
FIGS. 3 and 4 show the pallet sled 10 in an interim position of raising theupper frame 14 relative to thelower frame 12. For example, the user may activate thelift mechanism 30 by pumping the hydraulic mechanism foot pedal, causing the lift mechanism to lift upward on thecradle 19. This causes theupper frame 14 to lift upward relative to thelower frame 12. -
FIGS. 5 and 6 show the pallet sled 10 in a fully raised position, i.e. theupper frame 14 is the maximum distance from thelower frame 12. As thelift mechanism 30 continues to lift theupper frame 14, theupper frame 14 pivots upward (and somewhat inward/rearward) on theinner pivot arms 18 andouter pivot arms 16. In the fully raised position, theinner pivot arms 18 are substantially vertical and theouter pivot arms 16 are within 10 or 15 degrees of vertical. As shown, in this position, the outer ends of theupper frame 14 are higher above the floor than are the inner ends of theupper frame 14 and thecradle 19. This is implemented by the length of theouter pivot arms 16, the length of theinner pivot arms 18 and their respective pivot axes, which are all selected to cause theupper frame 14 to tilt toward the inner end slightly (e.g. approximately 1.5 to approximately 2.0 degrees). -
FIGS. 7-9 show the pallet sled 10 with theupper frame 14 in the low position. The pallet sled 10 is then rolled under apallet 50. Thepallet 50 includes adeck 52 for supporting goods (such as cases or crates of beverage containers) thereon and a plurality offeet 54 supporting thedeck 52 above the floor. Thefeet 54 are spaced inward from the outer periphery of thedeck 52. Theupper arms 15 are received under thedeck 52 outward of thefeet 54. Thecradle 19 also is received under thedeck 52. Thefeet 54 of thepallet 50 are received between theupper arms 15 and between thelower arms 13. In this position, theupper frame 14 andupper arms 15 are substantially parallel to the floor and to thelower frame 12 and to thelower arms 13. -
FIGS. 10-12 show thepallet sled 10 in the process of lifting thepallet 50 through an interim position, based upon actuation of thelift mechanism 30. In this mid-position, thefeet 54 are lifted from the floor. Theupper frame 14 andcradle 19 lift thepallet 50 by thedeck 52. -
FIGS. 13-15 show thepallet sled 10 with theupper frame 14 lifted to its uppermost, lifted position. As shown, in this position, the outer ends of theupper frame 14 are higher above the floor than the inner ends of theupper frame 14 and thecradle 19. This is implemented by the relative lengths and positions of theouter pivot arms 16 and the inner pivot arms and the positions of their axes which are selected to cause theupper frame 14 to tilt rearward toward the inner end slightly (e.g. approximately 1.5 to approximately 2.0 degrees). In this position, theupper frame 14 andupper arms 15 are tilted approximately 1.5 to approximately 2.0 degrees relative to the floor and to thelower frame 12 and to thelower arms 13. - Angling the
upper frame 14 and/or cradle towards thevertical handle portion 20/backrest could help with load stability by shifting the load center of mass towards the backrest. This is especially helpful when there is a sufficiently tall or imbalanced load orpallet 50. When angling the load back, the load contact with the vertical handle portion 20 (backrest) is increased also improving load stability. - Angling the
upper frame 14 and/orcradle 19 towards thevertical handle portion 20 may also help prevent the possibility that the loadedpallet 50 would slide off thepallet sled 10, especially when coming to an abrupt stop. An abrupt stop could occur when hitting a pothole or tall threshold without adequate speed. - Angling the
upper frame 14 also increases the frontal ground clearance of thepallet 50, particularly thelead feet 54. This is especially helpful when entering or exiting ground undulations such as ramps (ADA, sidewalk, etc.) and door thresholds. This may prevent thepallet 50 or load from bottoming out on the ramp or threshold. - Angling the
upper frame 14,cradle 19 or tine back may also permit theupper frame 14 andcradle 19 to be lower overall, which could increase maneuverability. The required support under thepallet 50 or load can also be reduced in length compared to a horizontal version due to the shift in center of mass rearward. A standard horizontal tine for a 48″long pallet 50 will be about 44-48″ whereas a tilted tine (the upper arms 15) could be shorter, less than or equal to approximately 38″ long, or approximately 29″ to approximately 38″ to provide the same amount of ground clearance. Generally, it is possible for theupper frame 14 to be less than 80% of the length of the pallet only if the frame is tilted. As another example, anupper frame 14 for a 42″ pallet could be approximately 33″ long or less. - While the desired angle of the tilt will vary depending on pallet 50 (geometry, rigidity, etc.) and application (pallet load, load geometry, required ground clearance, etc.), the linkage geometry allows the angle to be adjusted via the lengths of
pivot arms -
FIGS. 16 and 17 show an alternate pallet sled 210 with a manual lift mechanism (i.e. no hydraulics, but only mechanical leverage). The sled 210 includes alower frame 212 andupper frame 214 connected byouter pivot arms 216 and byinner pivot arms 217. Theouter pivot arms 216 are longer than theinner pivot arms 217. Ahandle 220 connects to thelift mechanism 218 at a forward end of the sled 210. A pair ofcasters 222 support thelower frame 212 at the forward end. A pair ofwheels 224 support thelower frame 212 at the rearward end. - The
handle 220 is pivotably connected to thebase 270 and thelower frame 212. A pair ofratchet plates 274 are also pivotably connected to the base 270 about the same axis as thehandle 220. Theratchet plates 274 are pivotably connected to theupper frame 214 by a pair ofangled brackets 275. Eachratchet plate 274 includes alow notch 277 and ahigh notch 282. - An
index crossbar 276 extends between vertical portions of thehandle 220 and through elongated openings in each vertical portion. Aspring 278 in each vertical portion of thehandle 220 biases theindex crossbar 276 downward. In the position shown, where theupper frame 214 is lowered, theindex crossbar 276 is also received in thelow notch 277 in eachratchet plate 274 and retained there by thespring 278. - A
pivotable folding lever 284 is mounted to thehandle 220. Thelever 284 can raise theindex crossbar 276 upward within the elongated openings in thehandle 220, compressing thesprings 278. - In
FIG. 16 , thehandle 220 is engaged with theratchet plates 274, with theindex crossbar 276 engaging thelow notches 277 of theratchet plates 274, so that theupper frame 214 is in the lowered position, close to thelower frame 212. - To raise the
upper frame 214 to the raised position, thehandle 220 can be pulled forward and down (not shown). This causes theratchet plates 274 to pivot forward, drawing theupper frame 214 forward and upward (pivoting onarms 216, 217). Theupper frame 214 may pivot forward to a point where thearms 216 are past vertical, so that theupper frame 214 will remain in place even after force on thehandle 220 is no longer applied. - As shown in
FIG. 17 , theouter pivot arms 216 are longer than theinner pivot arms 217. This causes theupper frame 214 to be angled forward toward thehandle 220. Angling theupper frame 214 and/orcradle 270 towards thevertical handle portion 220/backrest could help with load stability by shifting the load center of mass towards the backrest. This is especially helpful when there is a sufficiently tall or imbalanced load or pallet. When angling the load back, the load contact with thevertical handle portion 220/backrest is increased also improving load stability. - Again, angling the
upper frame 214,cradle 270 or arms back may also permit the pallet sled 210 to be shorter, which could increase maneuverability. The required support under the pallet or load can be reduced in length compared to the purely horizontal version due to the shift in center of mass rearward. A standard horizontal tine for a 48″long pallet 50 will be about 44-48″ whereas a tilted tine could be shorter, less than or equal to approximately 38″ long, or approximately 29″ to approximately 38″, to provide the same amount of ground clearance. Generally, it is possible for theupper frame 14 to be less than 80% of the length of the pallet only if the frame is tilted. As another example, anupper frame 14 for a 42″ pallet could be approximately 33″ long or less. - While the desired angle of the tilt will vary depending on pallet (geometry, rigidity, etc.) and application (pallet load, load geometry, required ground clearance, etc.), the linkage geometry allows the angle to be adjusted via the lengths of
pivot arms - In accordance with the provisions of the patent statutes and jurisprudence, exemplary configurations described above are considered to represent a preferred embodiment of the invention. However, it should be noted that the invention can be practiced otherwise than as specifically illustrated and described without departing from its spirit or scope.
Claims (20)
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US16/933,681 US11034371B2 (en) | 2019-08-19 | 2020-07-20 | Pallet sled |
CA3090565A CA3090565A1 (en) | 2019-08-19 | 2020-08-13 | Pallet sled |
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US201962888682P | 2019-08-19 | 2019-08-19 | |
US201962930842P | 2019-11-05 | 2019-11-05 | |
US16/933,681 US11034371B2 (en) | 2019-08-19 | 2020-07-20 | Pallet sled |
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US20210053602A1 true US20210053602A1 (en) | 2021-02-25 |
US11034371B2 US11034371B2 (en) | 2021-06-15 |
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US16/933,681 Active US11034371B2 (en) | 2019-08-19 | 2020-07-20 | Pallet sled |
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US11142232B2 (en) * | 2018-03-28 | 2021-10-12 | II James Dusa | Pallet jack assembly |
US11420338B2 (en) * | 2018-12-27 | 2022-08-23 | Toyota Research Institute, Inc. | Assistive robot systems for container tilting |
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US11034371B2 (en) | 2021-06-15 |
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